Azimuthal distributions of hadrons (mainly pi(+) and pi(-)) produced in DIS
off transversely polarized targets (proton and deuteron) are studied for t
he first time in SMC. From these azimuthal distributions, transverse single
-spin asymmetries are derived. According to Collins ('Collins effect'), the
azimuthal distribution of the leading hadron might exhibit an symmetry whi
ch originates from the transverse polarization of the final quark.