can I apply formica over formica?
You probably can, but I wouldn't do it myself.
Belt sand it with a 50 or 80 grit, use some denatured alcohol to clean it good and make sure there's no grease or oils on it. Your best results will come with a spray on contact glue, but you can probably use a brush on contact glue. Use a roller to make sure you seat it good.
Doing radii, you'll want a heat gun and roller. It can be tricky, if you go too slow, you can scorch it, if you go too fast, you can break it. The thickness of the laminate can play a roll in it, too. I've always used a 2" radius. If you have enough scrap, try playing with it to see what works.
Do the edges first, then the top.