To modify the parameter EtchedFilmThickness, perform the following steps
| Step | Action |
| 1 | Go to Solving >> Edit Parameters … to open the Variables and Functions dialog box. |
| 2 | Double click the entry “EtchedFilmThickness” in the User Variables list to bring the information into the User Variable declaration panel. |
| 3 | Change value in Expression to a new value, 0.6 |
| 4 | Click 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. |