Returns the index of the nearest non-zero width layer before this layer. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
Syntax
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Parameters
- thisIdx
-  Type:  System Int32  
 The layer from which to look for a non-zero width layer.
Return Value
The index of the layer found.Remarks
 If this layer is non-zero width, it will be returned. If there are non-zero width layers found, returns -1.