Fig. 46: Side view and top view of a POPOP layer grown on KCl(001). Films grow with the POPOP bulk structure in (102) orientation. The (102) plane contains POPOP molecules with their long axes in the plane forming a herringbone arrangement. Shown are the bulk lattice vectors a, b, c and the surface projected unit cell (red). The crystallographic b axis of the monoclinic bulk lattice is lined up with the [110] direction of the KCl(001) substrate to within 0.7 deg. The good epitaxial alignment indicates that the film structure persists all the way to the interface with the substrate.

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