Direct Observation of Surface-Controlled Self-Assembly of Coordination Cages by Using AFM as a Molecular Ruler We acknowledge the Nanolink Program of the MESA(+) Research Institute (University of Twente), the CNR Nanotechnology Programme, and MURST (Project Molecular Nanoelectronics) for financial support of this work. A special thanks goes to Dr. Maik Liebau (University of Twente) for the preparation of the microcontact-printed substrates and Dr. Frank Geurts (AKZO NOBEL, Central Research Arnhem, NL) for the XPS measurements.