width property
The width of the stroke symbol layer.
The return value may be any non-negative number (default is 0). A larger width means a larger stroke.
The measurement unit for the width is in device-independent pixels (DIPs) by default. To use meters in 3D, set the MultilayerSymbol.sceneSizeUnit property to SymbolSizeUnits.meters. This switches the interpretation of the width from DIPs to meters.