To obtain further insight into the relaxation process on the interface, we investigated interfacial structure after heating the sample. We prepared two PDMS/mica samples for heating; one was heated for 5.7 h at 80 °C and the other for 16 h at 80 °C. After the heating, both samples were settled for 24 h at room temperature, and the interface was investigated by the AFM. h of heating, in contrast to that for 142 h of settling at room temperature. The ∆γ-∆γhyd versus z curves were monotonic without oscillations for both heating time and showed an increase in the region of 1-2 nm from the nearest point to the solid surface, as in the cases of settling at room temperature.