I don't know how well thinset will stick to formica. It is pretty smooth and shiny. I suppose you could try a bit of thinset somewhere you could scrape it off as a test.
I think people also remove their original backsplashes and tile up the wall also. the backerboard would bridge that gap left by removing the backsplash.
I am pretty sure that link had pretty thorough instructions on tile setting. if not, the library or the lowes.com may have some usefull info.
http://www.lowes.com/lowes/lkn?action=howTo&p=Improve/TileFloor.html#6
http://www.floorstransformed.com/countertop.html this one describes preparing the countertop laminate instead of using backerboard.
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