qualitative agreement for both Py-PEG-Py(4250) and Py-PEG-Py(8650). The discrepancies in the region where most of Py-PEG-Py( 8650) is on the surface seem to arise from the requirements for excimer formation in a constrained geometry.Acknowledgment. This work was supported by the NSF-MRL Program through the Stanford Center for Materials Research.
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