Escape depth of secondary and photoelectrons from CdTe films with a Ba film

Escape zone depths $\lambda'$ for true-secondary electrons and photoelectrons from pure CdTe and CdTe with a Ba film of thickness $\theta\le$ 1 monolayer have been estimated for the first time. It is shown that upon a decrease of the work function of the surface by 2 eV, the value of $\lambda'$ increases by 1.2–1.3 times.