Maximum number of layers in Uplink for 5G NR?

Hi Experts,
How many layers max in uplink for NR?
How many UE can come in pairing with MU-MIMO in NR?
Is it 8 or 4 UEs?

Max 4 per UE.
Huawei has 8 PUSCH layers in UL for MU-MIMO.
So 4 UE paired in UL for MU-MIMO.