Looking for suggestions - window film

[Big EZ Signs LLC]

Hey all, I have had a customer give me an unusual request. He is wondering if there is a film that we can apply to his double-paned windows to cut down on the glare/reflections. and let people outside see in better. The windows are some of the thickest double-panes I've seen and the reflections on the inner pane make it really hard to see in. The customer wants to turn the area behind the windows into a showroom.

Thanks in advance,