The present invention discloses a solar panel mirror unit (1) being shaped, such as curved, and having a sandwich structure, said sandwich structure comprising an outermost front reflecting layer (2), intended as the sun reflecting layer and therefore having a reflective coating, said outermost front reflecting layer (2) consisting of a first material having a first thermal expansion coefficient, an intermediate layer (4) having a honeycomb structure and being the core of the sandwich structure, and an innermost rear layer (5) consisting of a second material having a second thermal expansion coefficient, wherein said first and second thermal expansion coefficients are equal or substantially equal.
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