@bhepler Two layers of one way glass works better than you might expect. The infinity effect probably isn’t as strong as a standard infinity mirror, but it’s still plenty deep for a good effect.
There are a couple of other issues you run into:
The first is the type of screen you use. LCD screens have a back-light, which means you see the edge of the screen (if you’re using a small screen like me), or you just dampen the infinity effect if the screen is as large as the mirror. An LED screen doesn’t have a back-light, and therefore works much better.
The second issue is that you don’t want the infinity effect making your smart mirror text unreadable. I solved this by using blue tinted reflective window tint to make my “one way glass”. (this also helped lower the cost). The blue tint absorbs a bunch of red light, so as long as I make my smart mirror monochrome red, the text stays readable. The false depth from the infinity mirror also creates a pretty cool effect where the text looks like it’s floating in space.