Hello,

To the best of my knowledge, there might be an option to define one’s own file, yu can refer to:

The Libraries Tab > Scattering Group > ABg Scatter Data Catalogs

@Raju.G - Onder is right, if no coating or scatter profile exists to represent your material, then the best path forward is to define your own scattering profile. You could do this with the ABg coefficients like Onder imaged above, or you could use BSDF or a scatter DLL. You’ll find more details about options for surface scattering in this article: https://support.zemax.com/hc/en-us/articles/1500005575662-What-scattering-models-are-available-in-OpticStudio-