Competition between Pauli and orbital effects in a charge-density-wave system

We present angular-dependent magnetotransport and magnetization measurement s on alpha-(ET)(2)MHg(SCN)(4) compounds at high magnetic fields and low tem peratures. We find that the low-temperature ground state undergoes two subs equent field-induced density-wave-type phase transitions above a critical a ngle of the magnetic field with respect to the crystallographic axes. This new phase diagram may be qualitatively described assuming a charge-density- wave ground state which undergoes field-induced transitions due to the inte rplay of Pauli and orbital effects.