Affiliation: | 1. IBM Research–Zurich, S?umerstrasse 4, CH‐8803 Rüschlikon, Switzerland;2. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang‐Pauli‐Strasse 10, CH‐8093 Zürich, Switzerland;3. IBM Research–Almaden, 650 Harry Road, San Jose, CA 95120‐6099, USA |