To modify the parameter EtchedFilmThickness, perform the following steps

1Go to Solving >> Edit Parameters … to open the Variables and Functions dialog box.
2Double click the entry “EtchedFilmThickness” in the User Variables list to bring the information into the User Variable declaration panel.
3Change value in Expression to a new value, 0.6
4Click Add/Apply to update the value.

The picture in the refractive index view, as in Figure 6, will change to a film thickness of 0.6 microns, and the simulator will solve the new structure.