layers

[Elham]

Hi
I would like to create a sequence diagram that shows the various layers
of my architecture.How can I do this?
My layers are UI,Business Facade,Business Rule,Common,And Data Acess layer.
My Application consistes of 10 subsyetems.
How can I show these layers and subsystems in my model.
Can some one show me some exmple of solutions?

Thanks Alot