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The Autocorrelation function of spectral determinants (ASD) is used to probethe sensitivity of a two-dimensional disordered electron gas to the system'ssize L.  For weak magnetic fields ASD is shown to depend only trivially on L, which isa strong indication that all states are localized.  From nontrivial dependence of ASD on L for infinite L at a Hall conductanceof 1/2 e^2/h we deduce the existence of critical wave functions at this point,as long as the disorder strength does not exceed a critical value.Comment: 4 pages, one citation correcte

Information about the Integer Quantum Hall Transition Extracted from the Autocorrelation Function of Spectral Determinants