Measurement of the conductance distribution function at a quantum Hall transition

We study the reproducible conductance fluctuations seen between the quantum Hall plateaus in the conductance of two-terminal submicron silicon MOSFETs. For the dramatic fluctuations at the insulator-to-first-plateau transition we find a conductance distribution that is flat between zero and $e^2/h$. We point out that this is consistent with the prediction of random matrix theory for a conductor with single-channel leads in a magnetic field.