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Will 1/4" plywood improve noise reduction of vinyl tile?

Vinyl tile has a Noise Isolation Class (NIC) of 45-49. Will 1/4 inch plywood under that on top of a concrete condo floor raise the NIC to 52?
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How should I prepare a plywood subfloor for floating vinyl plank flooring?

The floor of my laundry room was three layers of hideous vinyl flooring of various vintages, a layer of 3/4" plywood underlayment (to match the height of the vinyl to surrounding hardwood flooring) ...