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(a) The sheet resistance R□ versus temperature with an upturn in low temperature regime. The inset is an optical image of the Hall bar structure. (b) Normalized upturn resistances at fixed perpendicular fields. (c) Hall trace at 4.2 K in a magnetic field up to 50 T. (d) Normalized perpendicular field MR. The inset shows the MR dips around 0 T which are attributed to the WAL effect at low temperatures. The broken lines are guides to the eyes.
