The present disclosure is directed towards an attachment layer (17) for attachment to a data sheet (15) displaying data (16) and for attaching the data sheet (15) in a security document (10). The attachment layer (17) comprises a textile (81) comprising at least two yarns (80) having different haptic and/or optical characteristics. The present disclosure is further directed towards a a security sheet (11), a security document (10) comprising such a security sheet (11), methods of manufacturing such attachment layers, security sheets (11) and security documents and methods of authenticating such security documents.
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