Build oriented polymer

Hi,

I need your help about building oriented polymer. In Amorphous Cell, I used Liquid Crystal tab to constructing an oriented liquid crystalline phase polymer. However, the simulated result has a problem: the polymer molecules in the cell have significant different orientations. I want to know if there is any trick to set the parameters, e.g. density, periodic cell dimensions? If possible, please show me an example to buid oriented polymer.

Thanks!

Ann