Adding a 2008 R2 Domain Controller to an existing 2003 R2 domain

I have a domain with two Domain Controllers currently running 2003R2.  I need to add a 2008 R2 DC to the Domain.  Is there  a clear path to do this?  Is there a problem with 32-bit vs. 64-bit?
KirchtoeAsked:
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Seth SimmonsSr. Systems AdministratorCommented:
this should help getting the first 2008 R2 domain controller in place

Introducing your first Windows 2008 R2 Domain Controller
http://sharepointgeorge.com/2009/introducing-windows-2008-r2-domain-controller/

and no, there is no issue having mixed 32bit and 64bit domain controllers
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becraigCommented:
There are no contratints, 2008R2 can function in just about any domain functional lev el:

Just follow the normal process for adding a DC and ensure your Functional level matches one of those at the link below.

See below for a better understanding:
http://technet.microsoft.com/en-us/library/understanding-active-directory-functional-levels%28v=ws.10%29.aspx
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Windows Server 2008

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