Supporting information Zero in-plane thermal expansion in guest-tunable 2D coordination polymers Ryo Ohtani* † , Arnaud Grosjean ‡ , Ryuta Ishikawa § , Riho Yamamoto † , Masaaki Nakamura † , Jack K. Clegg ‡ , Shinya Hayami* † ¶ † Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555 Japan. ‡ School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane St. Lucia, Queensland 4072, Australia § Department of Chemistry, Faculty of Science, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan ¶ Institute of Pulsed Power Science (IPPS), Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto 860-8555, Japan. Corresponding authors: R. Ohtani, ohtani@kumamoto-u.ac.jp S. Hayami, hayami@kumamoto-u.ac.jp