Figure 1

STM images of Co islands on Ag/Ge(111)-√3 × √3 surface. (a) 80 × 80-nm² STM image showing the coexistence of Co-2 × 2 and Co-√13 × √13 islands grown on Ag/Ge(111)-√3 × √3 surface. (b) 10 × 10-nm² STM image of hexagonal-shaped Co(11-20)-2 × 2 island of 0.4 nm height. (c) 10 × 10-nm² STM image of stripe-like Co(11-20)-2 × 2 island of 3.7 nm height. In b and c, the angles between the atomic rows are given.