Hi,
If you are looking for that thick of a floor and want to apply it in a single coat we carry Urethane Mortars. These are the 'next step' after epoxy and are 3 component slurry type systems and truly self level. They are superb for high thermal shock and are usually used in food processing and brewery projects we do.
There is an A and a B and a special aggregate blend that makes a slurry like pancake batter and gets applied with a gauge rake. Cost though is not inexpensive about $4.25/sq ft due to the large amount of material required.
Please email us with dimensions and location for an exact quote.
Video link below shows the product being applied to a train station platform.