Lay concrete over concrete?
You would need to purchase or order a mix that specifically states it's ok for a 2" slab. Run of the mill bagged concrete is usually suited to 4", maybe 3" slabs.
Are you sure your stamp needs to press all the way through the concrete? You are not easily going to fit re-bar in a 2" slab, but in a thicker slab the bar would keep cracks from turning into crevasses.
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