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(a) ΔR = R(B) - R(0) as a function of B measured at various θ at 2 K. (b) ΔG(B⊥) curves after subtracting the bulk contribution. The data were measured at T = 2 K. (c) ΔG(B) as a function of B at various temperatures (θ = 0). The solid curves are the least-square fittings according to the 2D WAL theory. (d) α as a function of temperature obtained from the fitting. Its value near 0.5 rules out the issue of electron interference between two surfaces.
