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Scaling theory predicts complete localization in d = 2 in quantum systems belonging to the orthogonal class (i.e., with time-reversal symmetry and spin-rotation symmetry). The conductance g behaves as g ∼ exp(—L/l) with system size L and localization length l in the strong disorder limit. However, classical systems can always have metallic states in which Ohm’s law shows a constant g in d = 2. We...