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We report on electrical resistance measurements of an individual carbon nanotube down to a temperature T0ex{0ex}=0ex{0ex}20mK. The conductance exhibits a lnT dependence and saturates at low temperature. A magnetic field applied perpendicular to the tube axis increases the conductance and produces aperiodic fluctuations. The data find a global and coherent interpretation in terms of two-dimensional weak localization and universal conductance fluctuations in mesoscopic conductors. The dimensionality of the electronic system is discussed in terms of the peculiar structure of carbon nanotubes.
Langer et al. (Mon,) studied this question.