Abstract
We present a theoretical study of magnetoresistance for granular metals deep in the hopping regime, in the limit of large metal/insulator volume ratio, within the framework of coherent electron backscattering. We adopt the one-electron approximation, and examine effects of a magnetic field and spin-orbit interaction on the backscattering, both in the semi-classical approximation. We derive an expression for magnetoresistance characteristic of zero-dimensional systems, i.e. dots. The result is compared with previous experiments.