diff --git a/documents/Specification/MaterialX.PBRSpec.md b/documents/Specification/MaterialX.PBRSpec.md
index 606b63c42c..f9ad782dc1 100644
--- a/documents/Specification/MaterialX.PBRSpec.md
+++ b/documents/Specification/MaterialX.PBRSpec.md
@@ -2005,15 +2005,15 @@ surfaceshader open_pbr_surface(
     // Coat facing reflectance (F0), reused by the coat-darkening and emission terms below.
     float coat_F0 = ior_to_f0(coat_ior);
 
-    // Thin-walled subsurface: a translucent reflection/transmission pair scaled by the subsurface
-    // color, with 'subsurface_scatter_anisotropy' shifting weight from reflection toward
-    // transmission, blended in equal measure.
+    // Thin-walled subsurface: diffuse reflection and transmission lobes that share the subsurface
+    // color as their albedo, with 'subsurface_scatter_anisotropy' shifting weight from reflection
+    // toward transmission. The two weights sum to one, so the total albedo is the subsurface color.
     color3 ss_color = max(subsurface_color, 0.0);
     BSDF ss_reflection = oren_nayar_diffuse_bsdf(color = ss_color, roughness = base_diffuse_roughness,
-        normal = geometry_normal) * (subsurface_color * (1.0 - subsurface_scatter_anisotropy));
-    BSDF ss_transmission = translucent_bsdf(color = ss_color, normal = geometry_normal)
-        * (subsurface_color * (1.0 + subsurface_scatter_anisotropy));
-    BSDF subsurface_thin_walled = mix(ss_reflection, ss_transmission, 0.5);
+        normal = geometry_normal);
+    BSDF ss_transmission = translucent_bsdf(color = ss_color, normal = geometry_normal);
+    BSDF subsurface_thin_walled = mix(ss_transmission, ss_reflection,
+        0.5 * (1.0 + subsurface_scatter_anisotropy));
 
     // Closed (non-thin-walled) subsurface: volumetric scattering over the scaled radius.
     BSDF subsurface_volume = subsurface_bsdf(color = ss_color,
diff --git a/libraries/bxdf/open_pbr_surface.mtlx b/libraries/bxdf/open_pbr_surface.mtlx
index f1a757470b..72828f25a3 100644
--- a/libraries/bxdf/open_pbr_surface.mtlx
+++ b/libraries/bxdf/open_pbr_surface.mtlx
@@ -142,38 +142,22 @@
       <input name="roughness" type="float" interfacename="base_diffuse_roughness" />
       <input name="normal" type="vector3" interfacename="geometry_normal" />
     </oren_nayar_diffuse_bsdf>
-    <subtract name="one_minus_subsurface_scatter_anisotropy" type="float">
-      <input name="in1" type="float" value="1.0" />
-      <input name="in2" type="float" interfacename="subsurface_scatter_anisotropy" />
-    </subtract>
-    <multiply name="subsurface_thin_walled_brdf_factor" type="color3">
-      <input name="in1" type="color3" interfacename="subsurface_color" />
-      <input name="in2" type="float" nodename="one_minus_subsurface_scatter_anisotropy" />
-    </multiply>
-    <multiply name="subsurface_thin_walled_reflection" type="BSDF">
-      <input name="in1" type="BSDF" nodename="subsurface_thin_walled_reflection_bsdf" />
-      <input name="in2" type="color3" nodename="subsurface_thin_walled_brdf_factor" />
-    </multiply>
     <translucent_bsdf name="subsurface_thin_walled_transmission_bsdf" type="BSDF">
       <input name="color" type="color3" nodename="subsurface_color_nonnegative" />
       <input name="normal" type="vector3" interfacename="geometry_normal" />
     </translucent_bsdf>
-    <add name="one_plus_subsurface_scatter_anisotropy" type="float">
-      <input name="in1" type="float" value="1.0" />
-      <input name="in2" type="float" interfacename="subsurface_scatter_anisotropy" />
-    </add>
-    <multiply name="subsurface_thin_walled_btdf_factor" type="color3">
-      <input name="in1" type="color3" interfacename="subsurface_color" />
-      <input name="in2" type="float" nodename="one_plus_subsurface_scatter_anisotropy" />
-    </multiply>
-    <multiply name="subsurface_thin_walled_transmission" type="BSDF">
-      <input name="in1" type="BSDF" nodename="subsurface_thin_walled_transmission_bsdf" />
-      <input name="in2" type="color3" nodename="subsurface_thin_walled_btdf_factor" />
+    <multiply name="subsurface_scatter_anisotropy_half" type="float">
+      <input name="in1" type="float" interfacename="subsurface_scatter_anisotropy" />
+      <input name="in2" type="float" value="0.5" />
     </multiply>
+    <add name="subsurface_thin_walled_mix" type="float">
+      <input name="in1" type="float" value="0.5" />
+      <input name="in2" type="float" nodename="subsurface_scatter_anisotropy_half" />
+    </add>
     <mix name="subsurface_thin_walled" type="BSDF">
-      <input name="fg" type="BSDF" nodename="subsurface_thin_walled_reflection" />
-      <input name="bg" type="BSDF" nodename="subsurface_thin_walled_transmission" />
-      <input name="mix" type="float" value="0.5" />
+      <input name="fg" type="BSDF" nodename="subsurface_thin_walled_transmission_bsdf" />
+      <input name="bg" type="BSDF" nodename="subsurface_thin_walled_reflection_bsdf" />
+      <input name="mix" type="float" nodename="subsurface_thin_walled_mix" />
     </mix>
 
     <!-- Subsurface (non-thin-walled) -->
diff --git a/resources/Materials/TestSuite/pbrlib/surfaceshader/open_pbr_thin_walled_subsurface.mtlx b/resources/Materials/TestSuite/pbrlib/surfaceshader/open_pbr_thin_walled_subsurface.mtlx
new file mode 100644
index 0000000000..759f205a5d
--- /dev/null
+++ b/resources/Materials/TestSuite/pbrlib/surfaceshader/open_pbr_thin_walled_subsurface.mtlx
@@ -0,0 +1,12 @@
+<?xml version="1.0"?>
+<materialx version="1.39" colorspace="lin_rec709">
+  <surfacematerial name="M_open_pbr_thin_walled_subsurface" type="material">
+    <input name="surfaceshader" type="surfaceshader" nodename="SR_open_pbr_thin_walled_subsurface" />
+  </surfacematerial>
+  <open_pbr_surface name="SR_open_pbr_thin_walled_subsurface" type="surfaceshader">
+    <input name="geometry_thin_walled" type="boolean" value="true" />
+    <input name="subsurface_weight" type="float" value="1.0" />
+    <input name="subsurface_color" type="color3" value="0.816, 0.140, 0.124" />
+    <input name="subsurface_scatter_anisotropy" type="float" value="0.5" />
+  </open_pbr_surface>
+</materialx>