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The magnetoconductivity of a three-dimensional disordered electron gas is calculated from first principies with use of the exact electron eigenstates in a magnetic field, thus avoiding the usual semiclassical approximation in this field. Our calculation gives anisotropic components for the conductivity tensor, and the isotropic behavior predicted by other authors is recovered in the limit wcr << 1, where wc is the cyclotron frequency and r the elastic lifetime.doi:10.1103/physrevb.39.5798 pmid:9948998 fatcat:fnovgicg2ff63gizdnqatcobpy