My SharePoint Web Application http://SiteA is also accessible from extended web-application http://SiteAA. How to use IIS URL Redirect to redirect URL http://SiteA, but not the URL http://SiteAA?

Hi there

My SharePoint Web Application http://SiteA is also accessible from extended web-applicationhttp://SiteAA.
How to use IIS URL Redirect, so http://SiteA redirects tohttp://SiteB, but extended web application URL http://SiteAA should NOT redirect.

Thanks.