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After reading the thread below regarding cover saves for units which include MCs just like the tyranids i remembered this old trick a friend of mine pulls from time to time which seems really cheap but never got time to ask here.

When he move his gaunts squads he usually mix two squads in order to get cover save from both units like so:

Lets call 2 units of 15 gaunts each A and B, so what we see is something like this:

A A A A A
AA B B B B B
A AAAAAAA BB
BBB B B B B

Keeping the 2" coherence obviously, he claims cover save from both units since more than 50% of A is behind B, and at the same time more than 50% of B is behind A. We usually just start picking on him complaining each turn on how cheap that is till he stops doing it or just gets in assault range. Since we don't recall any rule not allowing you to just mix your units up that way. So i come to you dakka, and ask if there is something on paper regarding this?

This was covered in the rulebook FAQ.

Rulebook FAQ wrote:
Q: Who gets the 4+ cover save for intervening models
when two units are intermingled? (p21)
A: The unit with the model closest to the enemy that is
firing does not have a cover save