Abstract
In practical surface electron spectroscopy, inelastic scattering of electrons is very important to understand because it is related to electron transport in solids. Thus, following the publication “How is the Signal Attenuation in Surface Electron Spectroscopy Described? I, II, and III”, I have described how to understand and calculate the practical inelastic scattering of electrons, how to take and convert units, how to express the average of the inelastic scattering, and the relationship between the optical (dipole) and generalized oscillator intensities.