$RCWArefractiveindex

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 -2/period.

$RCWArefractiveindex

[n_{1,1} n_{1,2} n_{1,3}]-lambda1  [n_{1,1} n_{1,2} n_{1,3}]-lambda2                layer1 - Nlambda * xdiv 
[n_{2,1} n_{2,2} n_{2,3}]-lambda1  [n_{2,1} n_{2,2} n_{2,3}]-lambda2                layer2 - Nlambda * xdiv 
...
total layer