Figure 2.

Formation of {105} facets from shapeless areas with excess of Ge: STM images of different phases of faceting, T_gr = 650°C, h_Ge = 5 Å; a a shapeless Ge 'heap' without faceting, 150 × 141 nm; b at the outset of faceting, 64 × 64 nm; c-e after growth stoppage and annealing at the growth temperature; c 72 × 72 nm; d 46 × 46 nm; e 23 × 23 nm.