Abstract
We use the crosscap constraint to construct open descendants of the 0B string compactified on T 6/ Z 3 and on T 4/ Z 2 free of tachyons both in the closed and in the open unoriented sectors. In four dimensions the construction results in a Chan-Paton gauge group U(8)⊗U(12)⊗U(12) with three generations of chiral fermions in the representations ( 8,1, 12)⊕(8,12,1)⊕(1, 66,1)⊕(1,1,66) .
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