What does default option `model layers separately' --> unchecked mean? What should be done to avoid this?
This means all trace layers are lumped together for each subgrid.
In order to prevent lumping of the layers in the thickness direction for better accuracy, one can use `model layer separately` option in the board layer information panel.
This option will require more mesh for the board to make sure all layers have mesh.
Icepak automatically creates zero resistance plates in each layers to make sure this mesh requirement.
For additional information, refer following section:
Icepak 12.1 User Guide -> Importing and Exporting Model Files -> Importing Trace Files into ANSYS Icepak -> Importing Trace Files