Supporting Information: Eliminating Fatigue in Surface-Bound Spiropyrans Sumit Kumar, †,‡ Saurabh Soni, †,‡ Wojciech Danowski, †,‡ Isaac F. Leach, † Shirin Faraji, † Ben L. Feringa, †,‡ Petra Rudolf, *,† and Ryan C. Chiechi *,†,‡ †Zernike Institute for Advanced Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands ‡Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands E-mail: p.rudolf@rug.nl; r.c.chiechi@rug.nl S-1