The molecular orientation of copper(II) phthalocyanine (CuPc) thin films on monolayer on Ag(111) was studied by in situ near-edge x-ray absorption fine structure measurements and low-temperature scanning tunneling microscopy. It is found that in densely packed thin films, CuPc molecules adopt a standing-up configuration with the molecular -plane tilting slightly from the surface normal on monolayer .
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