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Localization Exponent for the Second Landau Level in the Quantum Hall Effect

At temperature above 1K, we measured the temperature dependence of the longitudinal and Hall resistivity ρxx, ρxy in the regime of the quantum Hall plateau-to-plateau transitions. The localization exponent v is extracted with an approach based on the variable range hopping theory. We find the quantity v ≈ 2.3 at the second Landau level, which is proven to be accurately universal.