It is argued that electronic states should be localized in any wire whose impurity resistance is greater than about 10 kΩ. At sufficiently low temperatures this will lead to a $T^{-2\mathrm{}}$ increase in resistance because one-dimensional phonons or excited electrons are needed to cause transitions between localized states. An estimate is made of the temperature needed to observe this effect.

• Received 11 July 1977

DOI:https://doi.org/10.1103/PhysRevLett.39.1167