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The crystal and defect structure of polycristalline vapour‐deposited gold films has been examined by transmission and reflection electron diffraction. Accurate measurements have shown conclusively that extra differaction rings in transmission electron diffraction patterns arise by double diffraction across twin boundaries and not from a hexagonal close packed phase of gold, as has recently been suggested by several authors. The double diffraction rings in transmission patterns from [111] textured specimens arise mainly from crystals which are twinned about the texture axis. A comparison is made between transmission and reflection patterns from these crystals and the advantages of the transmission technique for this type of investigations are emphasized.

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