THE ESTIMATE OF THE ELECTRON-PHONON COUPLING-CONSTANT IN THE THIN-FILM

Hamiltonians of electron-phonon interaction for thin metallic films ar e formulated. This is the basis for the estimate of the superconductiv ity critical temperature for films and corresponding bulk structures. It is shown that the interaction of surface electrons in the film with bulk phonons could explain the experimental fact that critical temper atures of the films are higher than the corresponding ones in bulk (ma ssive) structures. Since above fact is valid nearly for all pure metal lic, one can conclude that the dominant form of the interaction in fil ms is the interaction of surface electrons with bulk phonons.