Tiers are physically separation of tiers means in different projects, dll or exe. When we talk about Layers means logical separation of tiers.
Layers means way to organizing the code logically not physically. Tiers means code separation on network or process boundaries.
There are few good articles
Rocky's post
http://dotnet.org.za/kevint/archive/2005/02/21/14699.aspx
http://davidhayden.com/blog/dave/archive/2005/07/22/2401.aspx
Cheers!!!
Mahesh
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