For general US market sectors these are the correlations to IWM :-

XLF 0.74
XLV 0.70
XLB 0.84
XLY 0.82
XLK 0.84
XLE 0.67
XLI 0.85
XLP 0.57
XLU 0.54

So if we are looking for the least correlated sectors for a new Robot - Utilities, Consumer Staples and Energy may fit the bill at this present time.

Trev