The objective of the present study is to reveal the temperature response of a cationic diblock copolymer, i.e. poly(N-isopropylacrylamide) (PNIPAAM)-block-poly((3-acrylamidopropyl)trimethyl ammonium chloride) adsorbed onto a solid surface and the effect of gamma-cyclodextrin on the polymer layer structure. In our recent ellipsometry studies we observed that the copolymer adsorbs onto a silica surface and the adsorbed thickness showed a strong contraction by increasing temperature above 40°C, which coincides with the LCST of PNIPAAM. The information from neutron reflectivity measurements will reveal the copolymer structure at the interface and how the copolymer and gamma-cyclodextrin interactions effect the thermal response of the adsorbed polymer layer at different PNIPAAM block lengths and polymer surface coverage.