Experiments were performed at the UBC under ultrahigh vacuum conditions (<5 × 10−12 mbar) using a low-temperature scanning tunneling microscope (Scienta Omicron) at liquid helium temperatures (∼4.2 K). All images were acquired in constant-current mode using a cut platinum-iridium tip, which was conditioned by voltage pulsing and gentle indentation into a Ag(111) crystal. The samples were annealed at 550°C overnight with a final pressure of p = 3 × 10−10 mbar in situ before the STM measurements.

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