I5 NA exhaust manifold gaskets -- which way?

[Jan Pinkowish]

Stock I5 NA 2.2L exhaust manifold-to-cylinder head gaskets have metal on one side.
I am somewhat but not totally embarrassed to ask the following:

Which way does the metal face -- towards the cylinder head or towards the manifold flange?

Huw's photos of the exhaust manifold gaskets in the documentary of Brendan's engine rebuild are inconclusive, but his "Tips and Tricks" section says to face the metal towards the cylinder head.  A web search yields results that go both ways.

What's the operating logic for a one-metal-sided gasket?

Jan Pinkowish