S1 Semiconducting polymer thin films by surface-confined stepwise click polymerization Euiyong Hwang, Kathie L. Lusker, Jayne C. Garno, Yaroslav Losovyj, and Evgueni E. Nesterov * Supporting Information I. Additional figures. Figure S1. Alternating bathochromic and hypsochromic shifts in the growing film of polymer P1 absorption maximum during stepwise click polymerization (steps 33 and 34 shown). Dashed traces show absorption spectra of the monomer compounds 2 and 3 in solution. Figure S2. Comparison of absorption spectra of a thin film of P1 and of a spin-cast film of the soluble model polymer P3 (spin-cast from CHCl 3 solution). Electronic Supplementary Material (ESI) for Chemical Communications This journal is © The Royal Society of Chemistry 2011