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Overview AFM images of (a) sample A, image height , and (b) sample B, .
AFM amplitude image of sample A showing coalescing hexagonal islands. The outlines of the two islands are highlighted by solid black lines. The boundary between them is highlighted by a dotted black line. The “boundary region” (as defined in the text) is highlighted by a heavy white box and the positions of TDs intersecting the (0001) surface by black circles.
A coalescence boundary in sample B. White dashed lines highlight trench features related to coalescence. A dislocation array is seen running at 90° to the apparent boundary—highlighted by black arrows.
(a) A three-dimensionally rendered AFM topography image showing a small island (highlighted by a black arrow) being overgrown by a large island. Lateral scale: /division, vertical scale: /division. (b) A higher magnification AFM amplitude image of the smaller island indicated in (a). TDs impinging on the small island’s surface are highlighted by black circles. Note the surface step near the center of the small island.
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