As the temperature decreases from 300 to 10 K, the resistivity of the Bi 20 nm film shows a decreasing trend, a characteristic of metals, whereas that of the Bi 9 nm films shows an increasing trend, a characteristic of semiconductors.
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As the temperature decreases from 300 to 10 K, the resistivity of the Bi 20 nm film shows a decreasing trend, a characteristic of metals, whereas that of the Bi 9 nm films shows an increasing trend, a characteristic of semiconductors.