We have studied the negative magnetoresistance and universal conductance fluctuations (UCF's) in a two-dimensional electron gas (2DEG) grown on substrates with prepatterned, submicrometer dimples. Since the 2DEG is sensitive only to the normal component of B, electrons move in a spatially inhomogeneous (B perpendicular to the substrate: B_⊥) or sign-alternating random magnetic field (B parallel to the substrate: B_∥). Quantum interference effects in a random magnetic field due to the magnetic flux appear only due to second-order effects. The UCF's are found to be 1.5--2 times smaller for B_∥ than for B_⊥. {} 1996 The American Physical Society.
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Gusev et al. (1996) studied this question.
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