$RCWAsourceposition
$RCWAsourceposition required setting tag the layers you want to put the light sources. This number needs to be set in the beginning of input file. It relates to $RCWAsourcelength.
Example
$RCWAsourceposition
3 - layer3 2 - region2 at layer3
The $RCWAsourceposition setting in GUI interface is here
1. Press Set up the multiple light sources.
2. Fill in the field for Layer and Region as needed!
