The paper reports on a comprehensive investigation of the effect of we
ak localization and interaction of electron and the electron overheati
ng effect in thin (about 100 angstrom) bismuth films at helium tempera
tures. The temperature dependences of the time of electron relaxation
inelastic process have been obtained from the magnetic field dependenc
es of the quantum corrections to conductivity, and the alteration of t
he quantum corrections to conductivity under electron overheating have
been used to find the temperature dependence of the electron-phonon s
cattering time in the temperature range where the electron kinetics is
dominated by the electron-electron interaction processes.