erial 170, which may include a fiber (e.g., glass, quartz or silica) reinforced composite material, and a second flexible sheet of material 172 including a carbon fiber reinforced material may be combined (FIG. 6A) such that, upon curing of the longitudinal member 122 (or other bonding of the two layers 170 and 172) at an elevated temperature (e.g., above ambient), the mismatch in CTEs of the two