Transparent element with diffuse reflection

A transparent layered element, comprising:

• a first outer layer comprising a dielectric material,
• a second outer layer comprising a dielectric material, and
• a central layer,
• wherein the first and second outer layers each comprise a smooth outer main surface,
• the dielectric material of the first outer layer has substantially the same refractive index as the dielectric material of the second outer layer,
• the central layer is inserted between the first and second outer layers,
• the central layer is:
• a single dielectric layer having a refractive index different from that of the first and second outer layers,
• or
• a stack of layers which comprises a dielectric layer having a refractive index different from that of the first and second outer layers,
• an absolute value of a difference between the refractive index of the first and second outer layers at a wavelength of 550 nm and the refractive index of the dielectric layer of the central layer at a wavelength of 550 nm is greater than or equal to 0.3,
• the transparent layered element further comprises textured contact surfaces, which are between two adjacent dielectric layers having different refractive indices,
• wherein each of the textured contact surfaces is textured and parallel to each of the other textured contact surfaces, and
• wherein, in the central layer, the dielectric layer has a uniform thickness.