NOVELTY - The structure (10) has a flexible support (3), a reflective layer (2), and a thin glass sheet (1) attached on the support that is adapted to be deformed so as to form the thin glass sheet. The support is formed by a composite material composed of fibers embedded in a resin, where form and/or nature and/or thickness of the fibers are selected according to a value of expansion coefficient of the sheet. Mechanical characteristics of the support are given such that a neutral line of deformation in inflection of the structure is positioned at an interface of the sheet and the support.    USE - Multi-layer reflective structure for manufacturing a reflective surface e.g. concave, large-sized and curved mirror such as parabolic mirror and parabolic trough for a solar energy concentration device (claimed) e.g. parabolic or parabolic trough solar concentrator.    ADVANTAGE - The utilization of the composite material support prevents propagation of cracks, so that an impact resulting from the projection of hail or stones remains localized, thus making the structure to be transported easily and handled without breakage risk. The structure can be put in any shape according to an S-curve for manufacturing the reflective surface by a precut unit that is operated appropriately by water jet while ensuring that the cutting operation of the reflective structure does not generate a rupture. The structure utilizes materials whose nature ensures manufacturing of light weight of a solar concentrator.    DETAILED DESCRIPTION - The fibers are glass fibers and/or carbon fibers and/or fibers of aramide and/or vegetable fibers. An INDEPENDENT CLAIM is also included for a method for manufacturing a solar energy concentration device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of a multi-layer reflective structure.    Thin glass sheet (1)    Reflective layer (2)    Flexible support (3)    Multi-layer reflective structure (10)    Upper face of sheet (11)