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The dc conductance of Langmuir films of the Cd salts of fatty acids CH3- (CH2)n-2-COOH, with various n, has been measured at liquid-nitrogen temperature. The conductivity decreases exponentially with increasing chain length of the fatty acid molecules. This agrees well with the theoretical prediction for hopping conduction in a multilayer system associated with interface states.
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Sugi et al. (1975) studied this question.
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