Abstract
The effect of nonmagnetic-impurity scattering on the Landau-level width in a quasi-two-dimensional conductor is studied. It is shown that the square-root dependence of the Landau-level width on the magnetic field obtained by Ando and Uemura [J. Phys. Soc. Jpn. 36, 959 (1974)] in a two-dimensional electron gas crosses over to a (2/3-power law in a quasi-two-dimensional electron gas.