Flooring Tile - leveling a floor...

Not sure if this question is in the right forum...

I need to raise and level a 2' x 2' area. I need to raise it by 1/2" and the area is not level, so I can't just plop down some 1/2" plywood. I want to use a cement product to do this, but am not sure exactly what to buy to raise this area by 1/2". There is going to be a heavy cabinet moving in and out of the 2' area, so I need the area to end up level and smooth, and dont want to use portland cement with all the rocks in it. I need the product I end up using the be self leveling and leave a very smooth and hard surface so the rubber casters on the bottom of the cabinet can freely roll.
Any suggestions on the right product to purchase? thanks

You should be able to find self-leveling compound at a local home center. Ardex makes a quality compound.
http://www.ardex.com/main-products.htm