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The magnetic-field response of strongly localized electrons is probed by examining the quantum interference of forward scattering paths. With no disorder, there is a rich structure in the tunneling rate, which is sensitively dependent upon commensurability of the flux per plaquette with the flux quantum. With nonmagnetic impurities, there is a positive magnetoconductance, and the localization length appears to increase as B1/2. With impurities breaking time-reversal symmetry, the distribution of tunneling rates is not changed by the magnetic field.
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Medina et al. (1990) studied this question.
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