$RCWAxdiv

The $RCWAxdiv command is used to set material boundary number in each layer. It also needs to goes with the $RCWAxnode and $RCWAperiod to define position of boundary point and the period of simulation domain. The left boundary point does not need to assign.

$RCWAxdiv

3
3
5
3
3
...
total layer

The $RCWAxdiv setting in GUI interface is here
1. Press Add new layers for RCWA and fill in the fields as needed!

2. The order is from bottom to top.