This paper discusses the reflection and scattering from slightly-rough crystal surfaces using first-order vector Fresnel-Kirchhoff diffraction theory. Results are given in the conventional, Stokes- and Mueller-matrix representations for cubic and uniaxial crystals in particular orientations.
Eugene L. Church,
"Scattering from slightly rough crystal surfaces", Proc. SPIE 1530, Optical Scatter: Applications, Measurement, and Theory, (1 December 1991); doi: 10.1117/12.50507; https://doi.org/10.1117/12.50507