1We note that the electron attenuation length in the crystalline media is in general limited only by the inelastic scattering. The picture of elastic scattering appearing in the Boltzmann transport equation is superseded by the band theory where the Bloch electrons are formed by self-consistent multiple elastic scattering on the periodic potential and thereby propagate through the crystal without attenuation. The elastic attenuation is relevant in this theory only for the evanescent Bloch waves in the band gaps important at low energies (Barrett et al., 2005BB1, and references therein).