I'm just wondering why square cake pans are only 2" deep when professional round ones are 3" deep?

If you alternate shaped layers, like square bottom, then round on top, then small square on top -- how will that look, since the square will be shallower?

They have two inch and three inch square cake pans. Magic Line and Fat Daddio's both make them.

You could always make all of your tiers the same size by cutting the top off. But, it is popular now to have tiers to be different heights.

I need to follow up to my first post. You could always bake enough cakes to make your tiers the same height, by cutting off the top. Hope this makes more sense.