Comment on "Contribution of small closed orbits to magnetoresistance in quasi-two-dimensional conductors"

In a recent paper by N. Hanasaki et al. [Phys. Rev. B 57, 1336 (1998)] a pe ak in the angular dependence of magnetoresistance found in several quasi-tw o-dimensional organic metals is attributed to small closed orbits on the si de of the warped cylindrical Fermi surface when the magnetic field is nearl y parallel to the conducting plane. We discuss contributions from different orbits on the Fermi surface to the conductivity and argue that the effect is caused by open trajectories lying near the self-crossing orbit, rather t han by the small closed orbits. [S0163-1829(99)09339-X].