Scaling of Cylinder Spacings in Thin Films

The results of the analytical procedure are shown in Fig. 21 where characteristic distances between the cylinders are plotted as a function of the local thickness of the film. Quite strikingly, we observed a systematic variation of the lateral spacing between the cylinders as the film thickness increases from n to n + 1 layers of cylinders. Moreover, the characteristic spacings in the lower terrace was systematically 

5-1 nm smaller than that in the neighboring higher terrace (Figs. 21 and 4). The differences in the lateral spacings in the adjacent terraces vanish in the fourth layer [113]. The effect is clearly measurable and points to ID stretching of a unit cell in thin block copolymer films. 

---