gds layermap

Hi,

The GDS Import feature in HFSS requires a "layermap" file to correctly construct 3D objects in the Modeler - as opposed to sheets which is what I get when I import without the layermap. However, the help file has no information about the layermap format. Can someone please tell me what the layermap format is, so that my GDS import comes in as a 3D solid model instead of as sheets ? Thanks, all help is appreciated, Michael