Abstract
The twinning relationship in the intermetallic compound HoCu 2 was determined by single-crystal X-ray diffraction techniques. A 60 o rotation about the b axis between the two components of the twins was found. The twin plane is (103). The measured single-crystal lattice parameters deviate from those obtained from powder data by 0.03 A for a and 0.10 A for c. These deviations may be due to strain in the structure caused by the twinning. The same twinning geometry is believed to hold true for the other rare-earth-metal (REM 2 ) intermetallic compounds with the KHg 2 -type structure that exhibit massive twinning
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