Possibility of the 2D Anderson Transition and Generalized Lyapunov   Exponents
  The possible existence of the Anderson transition in 2D systems without interaction and spin-orbit effects (such as the usual Anderson model) becomes recently a subject of controversy in the literature. Comparative analysis of approaches based on generalized Lyapunov exponents is given, in order to resolve controversy. 
I. M. Suslov (P.L.Kapitza Institute for Physical Problems, Moscow,   Russia)