Multilayer structure comprising at least one diffusing layer.

The present invention relates to multi-layer structure (20), especially intended to be incorporated into a security document, comprising: - at least one watermark (16) or pseudo-watermark, - at least one diffusing layer (11), the latter being at least partially superimposed on the watermark or pseudo-watermark, the diffusing layer comprising a polymeric matrix having a refractive index n, and scattering particles bound by the matrix refractive index n different from that of the matrix, with a gap | n - n | greater than or equal to 0.01, more preferably 0.03.