$RCWAxnode
The $RCWAxnode command is used to define the position of boundary point in each layer which assigned in $RCWAxdiv. It also needs to goes with the $RCWAxdiv and $RCWAperiod to define number of boundary point and the period of simulation domain. The left boundary point does not need to assign which automatically set as -period/2.
$RCWAxnode
-10000 10000 30000 -10000 10000 30000 -10000 -2500 2500 10000 30000 -10000 10000 30000 -10000 10000 30000 ... total layer
The $RCWAxnode setting in GUI interface is here
1. Press Add new layers for RCWA and fill in the fields starting from the 2nd one, as needed!
