  X-ray scattering power of a plane parallel homogeneous slab of material is
derived using radiation intensity transfer equations.The scattering power
scales with the ratio of the scattering coefficient of interest to the total
attenuation coefficient. The results can be used to guide the choice of slab
thickness, scattering geometry and photon energy to maximize scattering power
in both elastic and inelastic X-ray scattering experiments.
