Asymptotic behavior of distribution functions of local quantities indisordered conductors is studied in the weak disorder limit by means of anoptimal fluctuation method. It is argued that this method is more appropriatefor the study of seldom occurring events than the approaches based on nonlinear$\sigma$-models because it is capable of correctly handling fluctuations of therandom potential with large amplitude as well as the short-scale structure ofthe corresponding solutions of the Schr\"{o}dinger equation. For two- andthree-dimensional conductors new asymptotics of the distribution functions areobtained which in some cases differ significantly from previously establishedresults.
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