Key points are not available for this paper at this time.
The transition from 2D to 3D growth of Ge on Si (001) has been investigated with scanning tunneling microscopy. A metastable 3D cluster phase with well-defined structure and shape is found. The clusters have a 105 facet structure. Results suggest that these clusters define the kinetic path for formation of ``macroscopic'' Ge islands.
Mo et al. (Mon,) studied this question.