A method comprises producing a base plate, wherein producing the base plate comprises forming a layer of a metallic material, and forming at least one first area in the layer of metallic material, wherein forming the at least one first area either comprises locally deforming the layer of metallic material, or locally inducing stress into the layer of metallic material, or both such that a deflection or a local stress or both in the at least one first area differs from a deflection or a local stress or both of those areas of the metallic layer surrounding the at least one first area.