Rand near seven-month lows vs dollar
Marcus took markets by surprise on Thursday when she announced, after the bank had left interest rates unchanged at 5.75 percent as expected, that she would be stepping down at the end of her term in November.
The rand was testing seven-month lows against the dollar on Friday. At 0648 GMT, it traded at 11.0875/dollar, compared with a 11.0750 close in New York on Thursday.
Analysts said the decline was a knee-jerk reaction to the announcement, underscoring the esteem in which Marcus was held by investors.
Dealers said the uncertainty of who will succeed Marcus was also making investors nervous.
"The way this has been handled is not the best: ideally there should have been a known succession plan in place months ago," Cairns said.
Yields on government bonds nudged down half a basis point to 8.235 percent on the benchmark 2026 bond, trading within Thursday's levels.
The National Treasury will be selling 800 million rand($72 million) in 2038, 2050 and 2025 inflation-linked bonds in the session. Results are due after auction closes at 0900 GMT.
(1 US dollar = 11.0830 South African rand)