Spec action for a Taylor is 2/32 on the treble side, and 3/32 on the bass side. That would be about as low as you can go and still have your guitar be playable. Martin spec is a little higher at about 2.5/32 and 3.5/32. That would be about the middle of the road, and where I think most people should start out. It gives you a reasonably easy feel, but also gives you enough of a dynamic range without buzzing that you can make real music. Martin spec USED to be 3/32 on the treble and 4/32 on the bass. That is high normal. If you play loud and hard all the time (if you play bluegrass, for example), then that is where you will probably need to end up.
I'm not real good at metric conversions, but 2mm seems really low, if I remember right.
Oh, and measure all of these from the top of the twelfth fret to the bottom of the string.
Light
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