get_back_drill_by_layer#
- PadstackInstance.get_back_drill_by_layer(from_bottom)#
 Get the back drill type by the layer.
- Parameters:
 - from_bottombool
 Whether to get the back drill type from the bottom.
- Returns:
 tupleof (Layer,Value,Value)Returns a tuple in this format:
(drill_to_layer, offset, diameter)
drill_to_layer : Layer drills to. If drill from top, drill stops at the upper elevation of the layer. If from bottom, drill stops at the lower elevation of the layer.
offset : Layer offset (or depth if layer is empty).
diameter : Drilling diameter.