A scaling theory for the interacting disordered fermion problem is constructed by extending the perturbation in coupling constant to second order. A scaling hypothesis produces a set of scaling equations which incorporates both localization and interaction. The resulting exponents are compared with experiments and further experimental tests of the theory are proposed.

• Received 20 December 1982

DOI:https://doi.org/10.1103/PhysRevLett.50.693