Replicated x-ray optics are fabricated by sputter deposition of reflecting layers on a super-polished reusable mandrel. The reflecting layers are strengthened by a supporting multilayer that results in stronger stress-relieved reflecting surfaces that do not deform during separation from the mandrel....http://www.google.co.uk/patents/US6278764?utm_source=gb-gplus-sharePatent US6278764 - High efficiency replicated x-ray optics and fabrication method
