Rasagar/Library/PackageCache/com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-properties/surface-options/use-profile-ior.md

Use IOR From Diffusion Profile Indicates whether the Material computes the fresnel color from the IOR of the diffusion profile, or using the Dielectric IOR set in the graph output. This is only available if Subsurface Scattering or Transmission is enabled.