ANDERSON LOCALIZATION IN ANISOTROPIC SYSTEMS AT AN ARBITRARY ORIENTATION OF THE MAGNETIC-FIELD

The self-consistent theory of Anderson localization is generalized to anisotropic disordered systems under the influence of a weak magnetic field with an arbitrary orientation. Contrary to the purely perpendicu lar and parallel magnetic held configurations, which can be characteri zed by only one anisotropy parameter, two parameters are necessary to describe the magnetoresistance in tilted magnetic fields. Numerical re sults obtained for the quasi-two dimensional regime are compared with the corresponding ones of quasi-three dimensional systems. Known limit s are reproduced.