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It is normally more convenient to describe rhombohedral lattice using a corresponding hexagonal setting. This is a very basic crystallographic question, and the answer can be found on almost all books on crystallography.
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You need a matrix to transform the indices and directions from hexagonal to rhombohedral or vice versa. You may have to work out such a matrix yourself and it is very simple if you understand the basic principles. There are some explanations in the Table of Crystallography A (starting from Page 78), which may be of your interest.
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