Thickness.indexOf Method
        
 Returns the first index at which a given thickness value can be found in the set of thickness values as defined clockwise from the top.
 
         
        Parameters
        
            - thickness
            
 
            - 
                
Type: Number
The value to locate in the thickness values. 
            - fromIndex
            
 
            - 
                
Type: Number (Integer)
The zero-based index at which to start the search.
Optional: True 
        
        Return Value
        
Type: Number (Integer)
The first index of thickness in the values, or -1 if not found.