  Previously known to form only under high pressure synthetic conditions, here
we report that the T'-type 214-structure cuprate based on the rare earth atom
Tb is stabilized for ambient pressure synthesis through partial substitution of
Pd for Cu. The new material is obtained in purest form for mixtures of nominal
composition $Tb_{1.96}Cu_{0.80}Pd_{0.20}O_{4}$. The refined formula, in
orthorhombic space group Pbca, with a = 5.5117(1) {\AA}, b = 5.5088(1) {\AA},
and c = 11.8818(1) {\AA}, is $Tb_{2}Cu_{0.83}Pd_{0.17}O_{4}$. An incommensurate
structural modulation is seen along the a axis by electron diffraction and high
resolution imaging. Magnetic susceptibility measurements reveal long range
antiferromagnetic ordering at 7.9 K, with a less pronounced feature at 95 K; a
magnetic moment reorientation transition is observed to onset at a field of
approximately 1.1 Tesla at 3 K. The material is an n-type semiconductor.
