Investigations of molecular redox films are of fundamental importance to numerous technologies. Scanning probe microscopy, in combination with electrochemistry, is uniquely suited to provide invaluable information concerning the potential-dependent structural, chemical, and electronic properties on these systems.

Acknowledgments. This work was supported by the Office of Naval Research (AASERT Program) and the National Science Foundation (Grant No. DMR-9107116). We are grateM to the Materials Science Center at Cornell University for the use of their AFM and STM facilities. J.E.H. acknowledges support by a Department of Education Fellowship and an NSF training grant.

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