I read this question "Lack of inversion symmetry" in crystal?, but it is not quite clear to me how to clearly define the symmetry. Let me explain with a simple example. In the image below you see the "L" shape which is not symmetric under inversion. However, if two "L" shapes are arranged like shown, we have a symmetry again.
So what would that mean for a material build up like that, would it show Second harmonic signal ?
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