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We have measured the magnetoconductance of amorphous Yₓ{Si}_{1{{-}}x}$ samples in the diffusive, barely, and deeply insulating regimes. Application of a magnetic field decreases the localization length {ξ} in the barely insulating regime where spin-orbit scattering (SOS) is important. In an insulator without SOS, we see an increase of {ξ}, indicating that spin-reversal symmetry and time-reversal symmetry control the magnetoconductance in the barely insulating regime, in contrast with predictions obtained by directed-path approximations.
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Hernandez et al. (1992) studied this question.
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