On page 4507, S. P. Lacour and co-workers present highly conductive and stretchable solid–liquid films that are formed by physical vapor deposition of gallium onto an alloying gold layer. The image shows patterns defined by lift-off on an elastomer membrane. The magnified view is a false-color scanning electron microscopy (SEM) image (×5000) of the surface of the films under 50% applied strain, showing the liquid Ga (blue–gray) flowing between the AuGa2/Ga clusters (gold).
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