NOVELTY - The rigid thin-sheet panel assembly configured as a truss has a non-rigid thin-sheet member having a planar area and serving as first chord of the truss, a backer having a planar shape and an area similar to thin-sheet member and serving as second cord of truss, and riser members which are diagonal members of the truss, and configured and disposed in an array which causes the assembly to have rigidity in selected direction in non-rigid thin-sheet member. A bar is coupled to a backer and extended between two adjacent riser members.    USE - Rigid thin-sheet panel assembly for use in solar collector troughs of solar concentrator assembly (SCA) used in solar thermal electric power generation facility.    ADVANTAGE - Truss design of a backing material component provides rigidity to the thin-sheet panel assembly. Maintains a thin panel, such as a thin sheet of glass or other reflective material, in a rigid or substantially rigid configuration. The thin-sheet panel assembly has lighter weight and inexpensive reflective surfaces. Thin-sheet panel assembly can be manufactured in flat configuration without hot forming, and thus can be manufactured at low cost. Attains greater overall mirror rigidity and improved accuracy. Enables easy installation, and attains reduced transportation cost. Eliminates or reduces secondary breakage resulting from heavy wind forces applied against the thick-glass structures. Attains interchangeability with or use in combination with existing solar troughs or other devices. Improves reflective performance. Attains open architecture for allowing moisture to drain or evaporate and thus prevent or deter the accumulation of moisture between components of the assembly.    DETAILED DESCRIPTION - The riser members of selected height and configuration are extended from the backer to distal ends connected to the reverse surface of the thin-sheet member. An INDEPENDENT CLAIM is also included for a support structure for supporting a thin panel to have rigid configuration.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of a solar concentrator assembly.    SCA (20)    Troughs (22)    Trough frames (30)    Torque plates (35)    Supporting pylons (40)    Bearings (45)