Figure 2

a The surface structure, characterized by a high density of domain walls. In the lower right corner, the grid used for determining the DW density is indicated, together with the intersections.b The surface in (a) after deposition of 1.1 ML Fe at 400°C showing a strong increase in domain wall density.c Island density (squares) after Fe deposition and characteristic diffusion length (triangles) as a function of the initial domain wall (DW) density prior to Fe deposition