How is it possible to get more than one layer in case of Transmit Diversity?

Hello Experts.

How is it possible to get more than one layer in case of Transmit Diversity?

If there are 4 antenna ports, then we can transmit 2 layers with transmit diversity.

E.g. Port 1 and port 3 with two layers.

And port 2 and 4 will transmit same data as port 1 and 3 with diversity.

But in that case RI = 2.

TM2 (Transmit Diversity) support only RI = 1?

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