PRL 94, 096102 (2005) P H Y S I C A L R E V I E W L E T T E R S week ending 11 MARCH 2005 096102-3 FIG. 4. Atomic resolution of KBr showing kink sites in h100i steps. The blurred, or noisy areas, are most likely C 60 molecules loosely bound at the kink sites. In (b) the molecule marked by the arrow has been removed in the imaging process, revealing the underlying KBr structure. (a) f ÿ7:1 Hz, A 7 nm, V bias 0:25 V; image size, 18 nm 18 nm. (b) f ÿ7:4 Hz, A 7 nm; image size, 18 nm 18 nm.