Subnanometer multilayers for x-ray mirrors: Amorphous crystals

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Abstract
The use of ‘‘natural’’ crystals as Bragg diffractors has been supplemented by the advent of artificial composition-modulated structures, that is, multilayers. The extension of optical systems using soft x rays to hard x rays is now supplemented by the synthesis of subnanometer repeat period multilayers. These structures consist of layering amorphous planes, each an atomic spacing thick, and may therefore be thought of as ‘‘amorphous crystals.’’