KCl concentration (the drop is linear, again around 1.2 °C for every 0.1 M, LCST at water = 32.2 °C). Based on this, we predicted that the folding of PNIPAM on PSiFe was facilitated upon adding ions to the subphase (with LCST around 31 °C). Nonetheless, the experiments were carried out at 20 °C and 40 °C to ensure that the "open" -"closed" transition occurred in the studied system.