Use your global var "Level".
In startup of layout1, this var allows you to initialise the level 1.
When in the "between" layout, add 1 to level (since it leads to the next level), and test the value of "Level".
If level is 1 => go to layout1
if level is 2 => go to layout2
Since the use of expressions isn't yet available for this (but on ashley's todo list already) this is the workaround.
There are other few examples in the how to do list in the section layout as well as the current trick to duplicate layouts (which is, I think, one of your next question if you haven't resolved it yet :D)