how to detect entity in an area with dx and dz but not dy?

I want to detect entities in the x and z axes, I don't care about their Y level, but I don't know how to do it?

execute positioned 
~-.9 ~ ~-.9
 if entity \@s[dx=0,dz=0] positioned 
~.8 ~ ~.8
 if entity \@s[dx=0,dz=0] positioned ~.1 ~ ~.1 run function test:myfunc

this is the code I am using, it is run at the target position and as the correct entity