Structure and epitaxy of double-layered heterostructure of organic materials formed on four kinds of alkali halides were investigated. These films were fabricated by vacuum deposition. Crystallographic orientation and mutual registration of organic double layers were examined by transmission electron microscopy(TEM) and atomic force microscopy(AFM). As concluded from these observations, we found three kinds of growth modes as for the second layers depending on the combination of materials. Selective on-top growth, one of the growth modes, is important phenomenon for fabrication of organicsuperlattice. Such selectivity originates not only in lattice matching between the two layers, but also in surface topography of the layers.