prep for stone exterior

Have I got this right?
inner to outer order:
plywood 30# felt 1/2" foam sheets with taped joints 1" air gap stone
Looked at Building Science site, but getting mixed up. One place seems to say use Tyvek under foam, but another says not to use Tyvek with brick/stone. If it makes a difference: near Austin, TX = hot, humid climate
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What is the stone attached to
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Stone (veneer) attached like brick (veneer) to wood frame: lays atop a ledge, joined with portland cement & masonry wall ties (nailed to wall). This is "real" stone, not "manufactured" stone.
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