Thin Engineered wood flooring is made basically from three layers, a solid wood top layer ranging from 2mm to 6mm in thickness.  Which is glued to thin pieces of plywood what run in different directions, this makes for a much more stable wood compared to solid wood.
Thin Engineered flooring come in two different ways of fitting the floor planks together, first it comes in tongue and groove edges which can be secret nailed to a wooden sub-floor or can be glued down if laying onto a concrete base.  Secondly Engineered floors come with an easy to fit click together system that can be installed as a floating floor, making installation easier.