Fig. 4.

The average relaxation time of (A) film middle ${\tau }_{\mathrm{m}\mathrm{i}\mathrm{d}}$ (open symbols), (B) substrate layer ${\tau }_{\mathrm{s}\mathrm{u}\mathrm{b}}$, and (A) free surface layer ${\tau }_{\mathrm{i}\mathrm{n}\mathrm{t}}$ as a function of inverse temperature $1/T$ for representative film thickness $h=8$ (black), 10 (red), and 12 (green) and polymer–substrate interaction $\epsilon =$ 0.5 (circles), 1.0 (squares), and 2.0 (diamonds). ${\tau }_{\mathrm{i}\mathrm{n}\mathrm{t}}$ (solid symbols with dashed lines) for all of the $\epsilon$ and thickness $h$ is nearly identical at the same temperature; ${\tau }_{\mathrm{m}\mathrm{i}\mathrm{d}}$ is nearly the same at high temperature and exhibits stronger $T$ dependence for thicker film; however, ${\tau }_{\mathrm{s}\mathrm{u}\mathrm{b}}$ shows a significant $\epsilon$ dependence.