Abstract
Scanning tunneling microscopy reveals that two-dimensional islands equilibrated on the surface of ice multilayers change their shape with increasing film thickness from triangular to hexagonal. We propose that this shape change is caused by a transition from polarized ice at the Pt substrate toward proton disorder (i.e., vanishing net polarization) at larger film thicknesses. A kinetic model estimates how quickly the substrate-induced proton order decays via introduction of protonic defects during growth.
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