[DefaultValue(0)] public float LayerSpacingParentOverlap {get; set;}
[DefaultValue(0)] public float LayerSpacingParentOverlap {get; set;}
A value greater than zero may still cause overlap between layers, unless the value of LayerSpacing is large enough. A value of zero might still allow overlap between layers, if LayerSpacing is negative.
This just gets or sets the RootDefaults's property of the same name.