@monicakm
When I went up from .05% to .1% I alternated their applications before going to just using the .1%. I did that for about a couple of months before ditching the .05%.
But unfortunately for me my skin never adjusted to the .1% and I had flaking everyday. It was a battle to keep up with the exfoliation so I decided that the .1% was not meant for me and I quit using it, went back to the .05% and I'm happy as a clam with that.
Moral of the story is some things aren't meant to be so just move or stay with the stuff that works and look back and say 'at least I tried and I gave it my best shot'. Live and learn.