We introduce a randomized decisive rule with a $\Delta$ -layer of signal indistinguishability for the reception of binary pseudorandom signals under deliberate interference (jamming). We find that for signals with base $n\le 2$ , when the layer thickness is optimal, the constructed receiver rule provides an increase in the guaranteed interference immunity of signal reception in the class of interference with limited average power, compared to the Kotelnikov receiver. The obtained value of the guaranteed error probability improves the actual upper bound for this quantity.
