Besides Isotactism, there are other two types of stereoregularity frequently found in the scientific literature:
Syndiotactism[?]- The monomers have alternating orientations within the polymer chain: AB-BA-AB-BA-AB-BA-etc
and Atactism[?]- The monomers have random orientations within the chain:
e.g. AB-AB-BA-AB-BA-BA-BA-AB-etc
wikipedia.org dumped 2003-03-17 with terodump