The zero-based index of the layer to remove.
true to remove the items, under the "Graphic Annotation Sequence", that reference the layer; false to remove only the layer.
This method removes the item, which represents a layer under the "Graphic Layer Sequence"(0070,0060). If annSequence is set to true then the method will clean any elements under the "Graphic Annotation Sequence" which correspond to the layer being removed.
For an example, refer to CreateLayer.