Then, the authors improve above results from mixed volume and projection bodies to the polars of mixed projection bodies and affine surface area, and get some analogous results.

Then we study the accuracy of Kirchhoff's approximation in the scattering of light field from the random self-affine fractal surface.

Experimental Study on Angle-resolved Light Intensity Scattered Profile and Roughness Exponent of Self-affine Fractal Surface.