According to documentation,
px[?][owq] [len]hexdump of N bytes (o=octal, w=32bit, q=64bit)
pr[?][glx] [len]print N raw bytes (in lines or hexblocks, 'g'unzip)
These two commands are how you see the bytes at a certain address in radare2.
Here is the top of my stack in radare2:
When I want to print out the 8 bytes RSP is pointing to by typing
pxq @ rsp, I only get the last two bytes. See here: