  We present the growth morphology, the long range ordering, and the evolution
of the valence band electronic states of ultra-thin films of copper
phthalocyanine (CuPc) deposited on the Au(110)-(1x2) reconstructed surface, as
a function of the organic molecule coverage. The Low Energy Electron
Diffraction (LEED) patterns present a (5x3) reconstruction from the early
adsorption stages. High-Resolution UV photoelectron spectroscopy (HR-UPS) data
show the disappearance of the Au surface states related to the (1x2)
reconstruction, and the presence of new electronic features related to the
molecule-substrate interaction and to the CuPc molecular states. The CuPc
highest occupied molecular orbital (HOMO) gradually emerges in the valence
band, while the interface electronic states are quenched, upon increasing the
coverage.
