title: Weak anisotropy and disorder dependence of the in-plane magnetoresistance in high-mobility (100) Si-inversion layers.
abstract: We report studies of the magnetoresistance (MR) in a two-dimensional electron system in (100) Si-inversion layers, for perpendicular and parallel orientations of the current with respect to the magnetic field in the 2D plane. The magnetoresistance is almost isotropic; this result does not support the suggestion of its orbital origin. In the hopping regime, however, the MR contains a weak anisotropic component that is nonmonotonic in the magnetic field. We found that the field, at which the MR saturates, varies for different samples by a factor of 2 at a given carrier density. Therefore, the saturation of the MR cannot be identified with the complete spin polarization of free carriers.
authors.affiliation: P. N. Lebedev Physics Institute, 119991 Moscow, Russia.
authors.forename: V M
authors.initials: VM
authors.lastname: Pudalov
authors.forename: G
authors.initials: G
authors.lastname: Brunthaler
authors.forename: A
authors.initials: A
authors.lastname: Prinz
authors.forename: G
authors.initials: G
authors.lastname: Bauer