Localization effects in a tilted magnetic field. Electron-electron interaction in semimetal films

The localization correction to the conductivity of thin Bi films has been measured as a function of the angle between the magnetic field and the film plane. This dependence is well given by the weak localization theory and permits the wave function phase relaxation time τ_φ{symbol} to be found. Comparison of the experimental τ_φ{symbol} for Bi and Sb films with those calculated for the electron-electron interaction in quasi-two-dimensional disordered systems suggests that it is the main mechanism of inelastic scattering in Bi and Sb films at low temperatures.