XFCE: trigger desktop's right-click "Arrange Desktop Icons" from the command line or script?

I'm trying to use XFCE with Termux on Android, and the behavior of the desktop icons is a complete mess. The size of the display is dynamic (four possible configurations when using the phone, continuous variation possible when running in a window). The desktop icons are constantly shuffling themselves in a completely random way through successive screen size changes and its a disaster. I'm happy with how Thunar places the dekstop icons with the "Arrange Desktop Icons" available in the desktop's right-click menu. How do I trigger this action at login, and automatically each time the display size changes?